Demountable headstock for lathes



A. L. UGON. DEMOUNTABLE HEADSTOCK. FOR LATHES. APPLICATION FILED MAY 3,1920l 15,42%?99@ Patented. July 18, 1922.v

4 SHEETS-SHEET l.

A. L. LIGON.

DEMOUNTABLE HEADSTOCK FOR LATHES.

APPLICATION FILED MAY 3, 1920.

1,422,994f. Patented July 18, 1922.

4 SHEETS-SHEET 2.

IVVENTOR A LLon.

A TTUR/l/EYS A. L. LIGON.

DEMOUNTABLE HEADSTOCK FOR LATHES.

l APPLICATION FILED MAY 3, 1920.

4 SHEETS-SHEET 3.

Patented July 18, 1922.

llllllllllll` www lllllllllii A. L. LIGON.

DENIOUNTABLE HEADSTOCK FOR LATHES. APPLICATION FILED IvIAY 3; 1920.

1,42%994, Patented July M1922.'

4 SHEETS-SHEET-4.

A LLoon. "y m95@ Arron/vm lith@ STATES@ ARTHUR LEE moon,

earsur` orifice.

or KILLEEN, muxas.

DEMOUNTABVLE HEADSTOCK FOR LATHES.

Specification of Letters yPatent.

Patented July 18, 1922.

.Application led May 3, 1920. Serial No. 378,620. i

of Texas, have invented certain nen7 and` uselul lmprovements inDemountable Headstocks for Lathes, of which the follow ing isspeciiication.

My invention relates to improvements in turning lathes, it being moreparticularly in the nature ot an improved head stock Which may beattached or detached to or 'from any of the existing types oit' small orlarge lathes.

A Further and'inore important object ott the invention is to provide an.improved head stock which is attachable to any of the ordinary types ofsmall or large lathes,iit being especially constructed to yenable thetaking ot' Work which would .otherwise be tar too large and cumbersome'for the lat-he to take. i

More speciiically stated, a further object of the invention is toprovidel a head stock, applicable to that type oit small turning ylatheordinarily found in machine shops. of such construction to enable thetaking of drill stems and other long Work to be Worked on,

such drill stems being far too long vto ber taken by the small latheaccording to the ordinary and usual arrangements.

A further ob]- ect of my invention is to provide a headstock of suchconstruction which enables extremely long drill stems to be taken by theordinary types ot small lathes for repair operations, `which lathes areordinarily totally incapable of taking such stems, Without cutting thedrill stems and necessitating subsequent welding.

Other objects and advantages will appear in the following specification.reference being had to the accompanying drawings, in Which2 Figure l isa side elevation ot a. `conven.

of Figure l, illustrating the reversing` mech anism,

Figure 5 is a detail side elevation oi the head stock attachment7 as itrappears when constructed in readiness for sale on ythe market, f

Figure 6 is a detail longitudinal section taken substantially on theline (56 of Figure`2,

Figure is a cross section on the line 7-c-7 of Figure l,

Figure 8 is a detail perspective vieiv ofA the reversing gear housing,

Figure 9 is a detail side elevation of a modification oithe end stockattachment, which embodies features ot universal adjustability which arenot disclosed in the form shown in Figure 5, and

Figure l0 is a detail cross section on the line'lO-lO of Figure 9. f

A s stated above, the improved head stock is manufactured and marketedas an attachment applicable particularly to small lathes, such as uforexample is illustrated in Figure l. Generallyy described, the lathecomprises the lathe bed l with the live head stock 2 at the lett end. f

The usual tace platefor chuck which accompanies the small lathe, isremoved .trom the driven spindle and the large drive gear of theimproved. head stock attachment is screwed in its place on the threadedend 5 ot the spindle. The tool carriage .6 is suitably mounted on thelathe bed, and extending longitudinally ot the bed is a .tired rack 7along which the head stock attachment is adjusted in the mannerdisclosed below.

The attachable head stock Scomprises a cylindrical body or barrel 9which revolves in the bearings 10o-f the main traine ll by means ot thedriving connections shown in Figure Q. These connections comprise headstock gears l2 and 13 on the respective ends ot ther-barrel 9. anddriving pinions le and on the transmission sleeve 16.

As indicated in Figure 6, the sleeve 16 is holloiv but arranged tosupport thetransmission shaft 17. in respect to Which the sleeve and theentire head stock 8 is slidable. A universal joint 18 .at the lett endci the shaft 17 joins a connection 19 and a second universal joint 20 tothe spindle 21 of the driven pinion 22.

Normally the pinion 22 meshes with the main drive gear 4 to cause therotation of the barrel 9 in one direction through the medium of thedriving connections just described, but the idler pinion 23 may beshifted into engagement with the main gear 4 in order to reverse thedirection ot' rotation oi the barrel. The reversing mechanism includesthe housing 24, which has bearings 25 and 26 in which the spindle 21 ofthe pinion 22 and the shaft of the idler 23 are respectively journalled.

A handle 27 with a spring detent 28 co operates with a quadrant 29 inpositioning the housing 24 in either the Yforward, neutral or reversepositions as designated by the three notches respectively indicated 30,31 and 32. Vhen the housing is shifted so that the detent occupies theupper notch 30, then the mechanism is in the normal running position.Vhen the middle notch is occupied, the parts are in the neutralposition; and when the lower notch 32 is occupied, the idler 23 engagesthe main gear 4, and the parts are in the reverse running position.

A stud 33 at one side ot the housing 24, provides the pivotal mountingVtor the housing in a block 34 which is adjustable in the slot 35 of abracket 36 by a screw 37. The bracket 36 is practically a part ot thebase 38 which is fixed on the guide 39 of the lathe bed 1, by means ofthe clamp plate 40 and bolt 41. Although the bracket 36 is fixed inrespect to the lathe bed 1, it may be adjusted 'for various positions,when .necessary, in respect to the main gear 4.

Returning now to the head stock: There is a spline and groove connection42, 43 between the transmission sleeve and shaft 16` 17, the grooverunning the full length otl the shaft so as to enable the sliding of thehead stock 8 practically to the end ot the transmission shaft. A chuck44 at the inner end of the barrel 9, has jaws 45 tor holding theadjacent end of the work 46, and a second chuck 47 at the right end oitthe barrel 9 has centering screws 48 for centering and supporting thework coaXially of the barrel.

Both chucks together with the adjacent gears 12 and 13 are securelytixed on the barrel 9 by means of the keys 49 or other equivalent means.The main frame 11 is clamped in various positions on the lathe bed 1 bymeans of the clamp plate 50 and bolt 51, but it is to be observed thatthe base ot the frame l1 is formed to easily slide on the guides 38 ofthe'bed in the event that the bolts 51 are unloosened to enable otheradjustments oi the head stock 8.

Movement of the head stock 8 along the lathe bed 1 when the clampingconnections 50, 51 are unloosened, is obtained by means ot turning thecrank 52 journaled on the bracket 53 of the main frame 11, which in turncauses the rotation of the adjusting pinion 54 so that the movement ofthe head stock results through the running of the pinion along the rack7. I-bolts 55, carried by the caps of the journals 10, enable theapplication of the hoisting apparatus 56 when it is desired to litt thehead stock 8 either on or orf of the lathe bed 1.

rihe modification in Figures 9 and 10, instead of consisting of apractically solid main frame 1l, comprises a main frame 11a which islaterally adjustable on the intermediate base 57, which in turn iscapable of vertical adjustment in respect to the lathe bed 1, by meansof adjustable wedge bases 58. Lateral recesses 59 in the main trame 11a,make room for the I-clamp bars 60, the lower ends ot which occupy theinverted 'i' grooves 61 in the intermediate base 57.

l/Vhen the nuts or" the clamp bolts 62 are unloosened so that the I-bars60 release their clamping engagement with the intermediate base 57 theadjusting screw 63 is to be actuated so as to convey the main frame 11laterally of the base 57. On the same principle, the adjusting screw 64is turned so as to move the wedge bases 58 either inwardly or outwardlyin respect to the intermediate base 57, the contacting inclined surfacescausing either the up or down movement of the structure supported on thewedge bases.

lt is thus to be observed that the head stock 8L in Figure 9 isuniversally adjustable, the arrangement therein embodied being verydesirable for obvious reasons. ln its other respects, the modified headstock 8l is of the same construction as that in Figure 3.

The advantages and operation of the invention may be briefly reviewed toadvantage. It is to be borne uppermost in mind that the head stock 8 inFigure 5 is sold as an attachment to any of the ordinary types of smallor large lathes usually to be tound in machine shops. The. head stockattachment makes it possible for the lathe to take work which is longerthan the lathe bed.

lThe ability to do this is ot especial value in the oil fields, whererepairs are often required to be made to drill stems, such as indicatedat 46 in Figure 3, which runs from four to fifty Yfeet in length.

The prevalent practice in repairing drill stems which are too long to beaccommodated by a small lathe, is to cut the drill stem to such a lengthas to include the part which requires repairing and to enable theinsertion of that part in the lathe. After the repair is made, the twoparts ot the drill stem or other long work must be welded again, but itoften occurs that the weld is imperfect so that in the subsequentoperation of the drill stem, it breaks at the weld and an expensivefishing operation is the result.

By using the improved head stock, drill stems which could never havebeen accommoda-ted without cutting, as described above,r may beaccommodated in a small lathe, the l'ront and rear chucks adequatelysupporting the work so that the repairing or turning operation may beperformed with perfect ease and satisfaction. The reader will understandthe manner of operation very readily in connection with the foregoing,all that is required being the insertion of the work 46 into the barrel9, tightening the jaws l5 of the front chuck and centering the work byadjusting the centering screw 48.

The lathe is started in the ordinary manner and the turning operationcan be carried out according torequirements. It is of course obvious byconsidering the drawings, that the ordinary lathe tail stock and centerrest have been removed so as to admit of locating the improved headstock 8. The head stock 8 may beadesc-ribed or illustrated as a cradlesupport which at once sustains the work over a rela-tively long base andat the same time turns it in respect to the turning tool.

While the construction and arrangement of the improved attachable headstock as herein described and claimed, is that of a generally preferredform, obviously modifications and changes may be made without departingfrom the spirit of the invention or' the scope of the claims.

1. An attachment for common lathes enabling turning work longer than thelathe bed, comprising a hollow head stock in substitution of the usualtail stock and center rest, drive means for said head stock inconnection with the lathe spindle, and means embodied in said drivemeans compensating for differences in location of the latter and of thehead stock.

2. An attachment for lathes enabling turning operation on work longerthan the lathe bed, comprising in combination with the driving spindleand head, a main gear applied to the spindle, a. main frame on the bed,with ournals supporting a barrel with work gripping and centering meanson each end, and a driven element fixed adjacently to each grippingmeans, with driving connections extending to the main gear` 3. Anattachment for lathes enabling the performance of turning operations onwork longer than the lathe bed, comprising in combination with thedriving spindle and bed, a main gear suitably applied to the spindle, amain frame adjustable to various clamped positions on the bed, a b-arrelsupported bythe frame, with means at one end for gripping and at. theother end for centering a piece of work axially of the barrel; anddriving means between the barrel and main gear, including drivenelements applied to the barrel at a plurality of places to secure auniform rotational torque, and associated driving elements mounted on asleeve with aA telescopic splined shaft with universal joint connectionsto a pinion engaging the main gear.

4. An attachment for lathesy enabling the performance of turningoperations on work longer than the lathe bed, comprising in combinationwith the spindle and bed, a main frame with means for clamping it inadjusted positions along the bed, a barrel journaled on the frame, witheach-end gripping means for supporting the work coa-Xially of thebarrel, and adjacently carried driven gears for distributing the drivingtorque; a transmission sleeve journaled on the frame, with driving meansengaging the gears; a transmission shaft splined and telescoped in thesleevek to maintain the driving connection regardless of the main framepositions, a main gear on the spindle, and shaft driving means includinga normally engaging pinion, in a housing pivot/ed on a bracket with anotched quadrant for the engagement of a detent in a handle on thehousing, for obtaining either a forward drive, a neutral position, or areverse drive, by shifting the housing, to bring an idler in the framein engagement with the main gear.

5. The combination of a barrel, with means for gripping an axiallyrotated piece of work, and a main gea-r from which the barrel isrotated; and intermediate driving connections including a telescopicshaft enabling a change of position of the barrel in respect to the maingear without severing the driving connections.

6. A head stock attachment for lathes, including a driving pinionbracket on a base with means for clamping it on the guides of the lathebed; and a work holder-supporting main frame adjustably slidable on thebed guides, but provided with fastening clamp means including bolts andclamp plates.

7. In combination with the guides of a lathe bed and a longitudinalrack, of a head stock attachment slidable on said guides but providedwith clamp means for fixing it in various positions, including aluacketsuj'iported cranked-pinion engaging the rack for moving the headstock to desired positions when the clamped means is unloosened.

8. A universally adjustable head stocky attachment fo-r lathes,comprising a main frame, and an intermediate base with means enablinglateral adjustment of the main frame thereon; and wedge bases beneaththe I-bars, with inclined end surfaces, and ad- 10 justing meansenabling the lateral adjustments of the main frame; and a base Wedgebeneath each inclined surface, with means enabling longitudinaladjustmentl to raise and lower the structure imposed on the base 15Wedges.

ARTHUR LEE LIGON.

